Nexus Marketplace is a complete and innovative e-commerce platform designed to connect buyers and sellers in a seamless, secure, and efficient digital marketplace environment.

Built with modern technologies and best practices, Nexus Marketplace simplifies the buying and selling process while providing powerful tools for product management, order processing, and business growth.

App

The platform features intelligent product discovery through AI-powered semantic search, enabling users to find exactly what they're looking for with natural language queries. With comprehensive seller management tools, sellers can easily list products, manage inventory, track orders, and engage with customers through an integrated review and rating system.

Nexus Marketplace includes advanced features such as automated cart management with seller-based grouping, flexible shipping options, secure checkout processes, and real-time order tracking. The platform also offers wishlist functionality, seller favorites, personalized product recommendations, and a robust notification system to keep users informed about their orders and interactions.

Built for digital transformation, Nexus Marketplace represents the future of e-commerce in Mozambique, with a focus on scalability, maintainability, and user experience. The platform includes KYC (Know Your Customer) verification for sellers, ensuring trust and security in transactions, and integrates seamlessly with external POS systems for businesses looking to expand their digital presence.

This platform was built with modern technologies, following best practices for scalability and maintainability.

Backend Architecture

The backend follows SOLID principles and a modular architecture based on NestJS, ensuring clean code and easy extensibility. We implemented comprehensive testing with Jest to maintain high code quality and reliability.

Core Technologies:

TypeScript for static typing and enhanced development safety
NestJS as the progressive Node.js framework for building efficient and scalable server-side applications
PostgreSQL for robust data persistence
Prisma as the ORM for type-safe database access and migrations
Redis (Upstash) for efficient caching, session management, and semantic search indexing
Google OAuth for seamless social authentication
Resend for transactional email delivery
Vercel Blob for cloud-based file storage and image management
Swagger/OpenAPI for automatic API documentation
Jest as the testing framework to ensure code quality and coverage
Docker for containerization and deployment

Key Features:

Multi-level authentication system (Seller, Buyer)
KYC verification system for seller onboarding and trust
Intelligent semantic search powered by AI for products and sellers
Comprehensive product management with categories, subcategories, and promotions
Advanced cart system with automatic seller grouping and shipping calculations
Complete order management with status tracking and notifications
Review and rating system with seller response capabilities
Wishlist and favorite sellers functionality
Personalized product recommendations based on user behavior
Real-time notifications (in-app and email)
Shipping calculation and address management
Integration API for external POS systems
Automated cron jobs for search synchronization and data cleanup
Webhook support for real-time integrations

Frontend Architecture

The frontend uses Feature-Sliced Design (FSD) architecture, which enabled smooth evolution of the platform over time and facilitated team collaboration through clear separation of concerns. This architectural approach promotes code reusability, maintainability, and scalability.

Tech Stack:

Next.js 15 with Pages Router for server-side rendering and optimized performance
React 18 for building interactive user interfaces with modern hooks and patterns
TypeScript for type safety and improved developer experience
HeroUI as the component library for consistent, accessible UI components
Tailwind CSS for utility-first styling and rapid UI development
TanStack Query (React Query) for efficient server state management and caching
TanStack Form with Zod validation for robust form handling
Framer Motion for smooth animations and transitions
PostHog for product analytics and user behavior tracking
next-themes for dark mode support
PWA capabilities for offline functionality and app-like experience

Key Features:

Responsive design optimized for mobile, tablet, and desktop
Progressive Web App (PWA) support for native app-like experience
Dark mode with system preference detection
Real-time search with dropdown suggestions
Infinite scroll for product listings
Optimistic UI updates for better user experience
Comprehensive error handling and user feedback
Accessible components following WCAG guidelines
SEO optimization with proper meta tags and structured data
Internationalization support ready

This architectural approach allowed the platform to scale effectively while maintaining code quality and developer productivity. The separation of features, shared components, and utilities creates a maintainable codebase that supports rapid feature development and team collaboration.